/Engine/Source/Editor/BlueprintGraph/Classes/EdGraphSchema_K2.h
Replace the variable that a variable node refers to when the variable it refers to does not exist
static void OnReplaceVariableForVariableNode ( class [UK2Node_Variable](API\Editor\BlueprintGraph\UK2Node_Variable) * Variable, [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * OwnerBlueprint, [FName](API\Runtime\Core\UObject\FName) VariableName, bool bIsSelfMember )